The HDF Forum allows HDF users to communicate with each other. Users are not required to subscribe to this discussion board to see prior posting archives, but must subscribe to it in order to post messages:
The HDF Group uses Jira to record bugs, issues, and feature requests. To browse and vote on issues, please login to https://jira.hdfgroup.org using your login and password created on www.hdfgroup.org to access binary downloads and post on the forum. If you don't have a login and password, please register.
The HDF Group maintains a list of third-party and HDF Software Using HDF5. If you have additions to this list, please send them to the help desk.
Papers and published materials by users can be found via the Media page.